New research shows cloth grocery store bags carry many kinds of bacteria.

An expert from Loma Linda University said too many people who use cloth shopping bags, instead of plastic bags, don’t wash them enough.

“Overall, we found that 10 percent of the bags had E. coli, about 50 percent around there had chloroforms and almost all of them had some kind of bacteria," said Dr. Ryan Sinclair, who tested the bags.

Scientists said they found the same type of bacteria in bags that someone would find in a pair of dirty underwear.

Researchers advise shoppers to include their reusable cloth bags with the rest of their laundry.